The percentage of Ca in CaCO3 is:
Correct answer: D. 40%
- A. 12%
- B. 10%
- C. 48%
- D. 40%
Explanation
Calcium (Ca) has a molar mass of 40 g/mol. Carbon (C) has a molar mass of 12 g/mol. Oxygen (O) has a molar mass of 16 g/mol (there are three oxygen atoms in CaCO3).Molar mass of CaCO3 = 40 g/mol + 12 g/mol + 3 * 16 g/mol = 100 g/molNow, use the formula to calculate the percentage of Ca in CaCO3:Percentage of Ca = mass of Ca/Total mass of CaCO3= (40 g/mol / 100 g/mol) x 100 = 40%So, the percentage of calcium (Ca) in calcium carbonate (CaCO3) is 40%.
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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